This might sound crazy to some of you guys, but I'm trying to see what's the smallest rim that will fit the Titan. It came with 18" rims from the factory, but it's a 4x4 and I can't see spending all that money on rims that will probably get scratched and bent. Will 16's or 16.5 fit? Tires and rims are alot cheaper for these sizes. Thanks in advance.